I love my N62 V8 still and the shape of such e53 that I keep maintaining it. Heck it's costing me $2500 right now but I love it still... Having SAID THAT, is love a diesel X5 as I hear they are very reliable but where I live it is NOT warm in winter so when the X5 would randomly spend time outside in winter...I would hate to start that thing. And more importantly I do not drive the X5 far.enough to work from home daily to warrant buying a more fuel efficient vehicle or keeping a diesel engine healthy. I would like to do the DPF delete as you have mentioned but then my garage would fill up with smoke each day I start it...so not really an option
I'm jealous tho and I hope you enjoy it just as much as your e53.

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S